body {
  width: 100%;
  max-width: 640px;
  min-width: 320px;
  font-size: 14px;
  line-height: 1.5;
  font-family: -apple-system, Helvetica, sans-serif;
  color: #666;
  margin: 0 auto;
  background-color: #fff;
}
* {
  margin: 0;
  padding: 0;
}
.clearfix:before,
.clearfix:after {
  content: "";
  display: table;
}

.clearfix:after {
  clear: both;
}

.clearfix {
  *zoom: 1;
}
img {
  border: 0;
  vertical-align: middle;
}
a {
  color: #666;
  text-decoration: none;
}
.app {
  width: 100%;
  height: 45px;
  background-color: #333;
}
.app ul li {
  float: left;
  height: 45px;
  list-style: none;
  line-height: 45px;
  text-align: center;
  color: #fff;
}
.app ul li:nth-child(1) {
  width: 8%;
}
.app ul li:nth-child(1) img {
  width: 10px;
}
.app ul li:nth-child(2) {
  width: 10%;
}
.app ul li:nth-child(2) img {
  width: 30px;
  vertical-align: middle;
}
.app ul li:nth-child(3) {
  width: 57%;
}
.app ul li:nth-child(4) {
  width: 25%;
  background-color: red;
}
/* 搜索 */
.search_wrap {
  position: fixed;
  height: 44px;
  overflow: hidden;
  width: 100%;
  max-width: 640px;
  min-width: 320px;
}
.search_btn {
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 44px;
}
.search_btn::before {
  content: '';
  display: block;
  width: 20px;
  height: 18px;
  background: url(../images/s-btn.png) no-repeat;
  background-size: 20px 18px;
  margin: 14px 0 0 15px;
}
.search_login {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 44px;
  line-height: 44px;
  color: #fff;
}
.search {
  position: relative;
  height: 30px;
  margin: 0 50px;
  border-radius: 15px;
  background-color: #fff;
  margin-top: 7px;
}
.jd_icon {
  position: absolute;
  top: 9px;
  left: 12px;
  width: 20px;
  height: 15px;
  background: url(../images/jd.png) no-repeat;
  background-size: 20px 15px;
}
.jd_icon::after {
  content: '';
  position: absolute;
  top: 0px;
  right: -10px;
  width: 1px;
  height: 15px;
  background-color: #ccc;
}
.jd_fdj {
  position: absolute;
  top: 9px;
  left: 50px;
  width: 18px;
  height: 15px;
  background: url(../images/jd-sprites.png) no-repeat -82px 0;
  background-size: 200px auto;
}
input {
  outline: none;
  border: none;
}
.search_input {
  position: absolute;
  top: 0px;
  left: 74px;
  height: 30px;
  line-height: 30px;
}
/* 主体 */

.main .focus img {
  width: 100%;
}
/* 品牌日 */
.brand {
  overflow: hidden;
  border-radius: 15px 15px 0 0;
}
.brand div {
  float: left;
  width: 33.33%;
}
.brand div img {
  width: 100%;
}
/* 导航 */
nav a {
  float: left;
  width: 20%;
  text-align: center;
}
nav a img {
  width: 40px;
  margin: 10px 0;
}
nav a span {
    display: block;
}

/* 快报 */
.news {
  margin-top: 30px;
}
.news a {
  float: left;
  width: 50%;
  box-sizing: border-box;
}
.news a img {
  width: 100%;
}
.news a:nth-child(n + 2) {
  width: 25%;
  border-left: 1px solid #ccc;
}
